If Miss Tan doesn't find everyone's permission slips, the class will miss their field trip! Maudie's beside herself after losing her special notebook.

Mrs. Maniaci's roses are ruined by a tampered sprinkler system. The students in Mr. Barker's class seem to be up to something.

The Inbestigators get hired to solve a mystery at the science fair, much to Ezra's delight. The star of the school play gets hurt during rehearsals.

Someone with great aim has ruined Esther's painting. Later, the Inbestigators need to move fast -- because there's a turtle thief on the loose!

It's an emergency when Mr. McGillick's "World's Best Principal" mug goes missing. Poppy's lost her hat, and now she can't play outside.

A little girl's drone flies off and disappears -- but the Inbestigators witnessed everything. For her birthday, Maudie's dad stops by the office.

The local animal shelter comes to school to film a commercial. At an event for future leaders, Ava's accused of stealing someone else's speech.

The Case of the Rosemary Riddle / The Case of the Robot Robbery

The latest snack craze sparks a theft at school. The kids throw Mr. Barker an awesome '80s-themed birthday party. Trouble is, they can't find the cake.

A miniature golfer's winning streak sounds too good to be true. The whole class is invited to a laser tag and pizza party ... or are they?

Ezra ordered pizza and got ... a salad roll. Who swapped the students' Treat Day lunches for healthier food? Then, the Inbestigators take on an intern.

Mrs. Maniaci's doorbell is broken, and nobody’s car keys are working. What's going on? Kyle and Ezra partner up for an online math competition.

A woman accuses the school's kindhearted crossing guard of stealing her handbag. The Inbestigators enter a competition for young entrepreneurs.

Someone sabotaged a wildly successful lemonade stand, but who? At a school fundraiser, the fortune teller's predictions are eerily accurate.

Who slipped Mr. McGillick's phone into a tub of rice -- and why? Later, the Inbestigators film a commercial. But first they have to find Ezra's fish.

Pixie's solar system diorama has gone missing, but did she make one in the first place? Maudie figures out who sabotaged Zac's dance recital.

There's a new girl at school who makes quite an impression on Ezra -- then the Inbestigators get their very first case.

Ava is devastated when Pixie stops talking to her after a sleepover. The new boy in school can fit a very big cookie in his mouth -- but how?

A prank caller keeps bothering Mrs. Maniaci in the middle of her soap opera. Kyle's favorite event of the year goes terribly wrong.

Maudie stashed a stack of tickets in a drawer for safekeeping, but somebody took them. A so-so soccer player is suddenly a lot better than he used to be.